Update model card: verified April 26 2026 blastn benchmarks, correct 5533 features, real OOD results

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Retrain protein k-mer with ProteinMPNN variants; holdout BoNT+Diphtheria

Update model card: add ProteinMPNN benchmark results

add protein k-mer model (AUROC 0.937, FPR 0.125)

v4 final: recall=91.8%, short-seq=79.7%, AUROC=0.977

v4 final: recall=91.8%, short-seq=79.7%, AUROC=0.977

v4 model: +Francisella/Monkeypox, short-seq +2.5%

v4 model: +Francisella/Monkeypox, short-seq +2.5%

v3: expanded ricin/abrin/Francisella/Monkeypox training data

v2: add codon-usage normalization features (RSCU+CAI+AA)

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initial commit